Xen Server upgrade to 6.2

The last main pool of Virtual Machines will be upgraded (6.0 to 6.2) soon, probably over the Bank Holiday weekend. Attempts to do a “smooth” migration failed for the last three pools, so this time it will not be attempted. The downtime of each machine should be short, but there will be some unavailable disruption to logged in users. Please email sys-admin if you have any particular availability requirements over the weekend.